A quick googling shows some sources claiming EVs are in general designed with a planned service life or around 10 years.
That's basically the same planned service life for ICE cars, which some sources claim it tends to be 12 years or 200k miles.
One source suggests battery capacity in EVs drop less than 2% per year on average.
These numbers seem to contradict you, but you show your data so that we can look into it.